[jdk17u-dev] RFR: 8276904: Optional.toString() is unnecessarily expensive

[Dan Lutker]

Backporting trivial performance fix

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Commit messages:
 - Backport fe2ae8e38bd8660cc637f13f425ccea17a11aa4f

Changes: https://git.openjdk.org/jdk17u-dev/pull/763/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=763&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8276904
  Stats: 4 lines in 4 files changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/763.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev pull/763/head:pull/763

PR: https://git.openjdk.org/jdk17u-dev/pull/763